Lam Research sells the machines that build chips layer by layer, and its sales jumped in the quarter to September 2026. The open question is whether a business resting on a few chipmakers and China can hold that level.
The chip inside your phone or laptop was built in thin layers on a silicon disc called a wafer. Machines laid down each layer, carved patterns into it and cleaned it before the next. Lam Research makes such machines, and your devices may contain chips made with its tools. Most of its revenue comes from China, Taiwan and Korea. Lam earns twice: once when it sells a new tool, and again by supporting the tools already running in customers' factories.
Chipmakers pay for tools that perform well, with few defects, solid support and a sensible overall cost to buy and run. A chipmaker spends heavily to test and approve a tool before using it in production. After that, it generally keeps that supplier for that step and chip generation while the tool performs. Picture a factory opening a new line: whoever wins each pattern-carving or layering step keeps selling into it, and each installed tool later feeds support revenue. The lock cuts both ways: Lam says it can struggle to sell to a customer that has already approved a rival's tool, and each new generation reopens the contest. What remains depends on winning those contests, spreading a large research budget over enough sales, and absorbing the cost of complying with government export limits and other rules, which the company says reduces net income.
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